Made streambuf const correct

src/main/common/streambuf.c

@@ -73,14 +73,14 @@ uint32_t sbufReadU32(sbuf_t *src)
     return ret;
 }
 
-void sbufReadData(sbuf_t *src, void *data, int len)
+void sbufReadData(const sbuf_t *src, void *data, int len)
 {
     memcpy(data, src->ptr, len);
 }
 
 // reader - return bytes remaining in buffer
 // writer - return available space
-int sbufBytesRemaining(sbuf_t *buf)
+int sbufBytesRemaining(const sbuf_t *buf)
 {
     return buf->end - buf->ptr;
 }
@@ -90,6 +90,11 @@ uint8_t* sbufPtr(sbuf_t *buf)
     return buf->ptr;
 }
 
+const uint8_t* sbufConstPtr(const sbuf_t *buf)
+{
+    return buf->ptr;
+}
+
 // advance buffer pointer
 // reader - skip data
 // writer - commit written data

src/main/common/streambuf.h

@@ -36,10 +36,11 @@ void sbufWriteString(sbuf_t *dst, const char *string);
 uint8_t sbufReadU8(sbuf_t *src);
 uint16_t sbufReadU16(sbuf_t *src);
 uint32_t sbufReadU32(sbuf_t *src);
-void sbufReadData(sbuf_t *dst, void *data, int len);
+void sbufReadData(const sbuf_t *dst, void *data, int len);
 
-int sbufBytesRemaining(sbuf_t *buf);
+int sbufBytesRemaining(const sbuf_t *buf);
 uint8_t* sbufPtr(sbuf_t *buf);
+const uint8_t* sbufConstPtr(const sbuf_t *buf);
 void sbufAdvance(sbuf_t *buf, int size);
 
 void sbufSwitchToReader(sbuf_t *buf, uint8_t * base);